I could be wrong, but seeing as the platinum ticket is not the Summon Premium Unit button, I don't think the spotlight affects it (much like the spotlight does not affect Summon Rare Unit, Summon Base Unit SB, or Summon Base Unit). I also vaguely remember attempting to look up if premium summon rates impacted it when they were first introduced on Nutaku and finding the answer from DMM to be negative, but that was a while ago so I may be mistaken. Is there anything that indicates otherwise?
Anyway, the ticket aside, might as well mention my own recent summon attempt story even if it wasn't today (it was Tuesday when she was first added). I'd decided to try rolling for Leda because a thief can be quite handy for some dailies and collection events. Started out by burning through my Pieces of Crystal ('d had about 250 saved up), and about halfway through I see the glow of a plat summon. Wind up getting Liddy, which wasn't bad as I didn't have her yet even if I'm not overly desirous of Pegasus Riders. All I'd had previously was a handful of the gold one who didn't seem strong enough to invest in leveling.
Alas, I did not get Leda with the shards, so I moved on to attempting premium rolls. That day I made around five or six rolls. The first one or two were irrelevant silver or gold units. Then, as I saw the glow of black, and found myself with Esther. I was slightly disappointed with the specific black, as out of those I'm missing I didn't really care about getting her, but she is one I'd lacked and she does seem potentially good as a gate keeper. I did at least now have all of the Pegasus Riders. However two rolls later, I once more saw the tell tale glow of black, this time getting Clissa. Once more I was somewhat disappointed, because I hadn't really been particularly interested in getting her outside rounding out my collection, but at least she is potentially useful, and she does complete my collection of Valkyries. After this I made another roll or two that had forgettable gold or silver results, and I did not succeed in getting Leda (though I did manage to attain her later in the week).
Overall, the results of the rolls felt a bit trolly. Having gotten two non-dupe black units, I can't really be too upset, yet at the same time they're blacks I'm not particularly interested in, and probably won't use any time soon. Aigis seems to have decided that day I was in need of more complete collections of riders, though if that's the case, I can't help but think Daisy, the last mounted premium unit I'm missing, might have the potential to see more use than the girls I got (though maybe not, as I do have a few good Ninja and a Sabinne already to fill my need for melee slot ranged, even if they aren't quite so long raged).